1.1.3 Input, Output and Storage
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Define and give some examples of an input device
Allows data to be entered into the computer • Keyboard • Scanner • Camera • Microphone • Sensor
Define and give some examples of an output device
Reports the results of processing to the user • Printer • Monitor • Speaker • Headphones • Actuator
Give some examples of an specialist input and output devices
Foot mouse Eye Tracker Puff/suck switch Screen Reader
What are the three types of secondary storage?
Optical Flash / Solid-State Magnetic
What are some examples and key facts about Optical Storage?
DVD / Blu-Ray / CD Read & written to using a laser on to a reflective surface Uses ‘pits’ and ‘lands’ (+) Robust enough for long periods of use (+) Low cost per MB (+) Small / Light / Portable (-) Slowest read/write speeds than others
What are some examples and key facts about Solid-State / Flash Storage?
Solid State Drive (SSD) | USB Memory Stick | SD Card (+) No moving parts so is more robust and quieter than alternatives (+) Lower power consumption due to the no moving parts. (+) Faster read/write times than others (+) Unaffected by magnetic fields (+) Smaller physical size (portable) (-) High cost per GB
What are some examples and key facts about Magnetic Storage?
Hard Disk Drive (HDD) (-) Moving parts so susceptible to damage when moved. (-) Physical size limitations due to moving parts (-) Lower read/write speeds than Flash (+) Cheaper per GB that Flash (+) Currently the largest storage medium
What is stored in RAM?
Stores software and data currently in use
What are the key facts about RAM?
Random Access Memory (RAM) * Primary Memory * Faster read/write speed than secondary storage media. * Volatile - loses contents when power is off • Stores software and data currently in use • Increasing size of RAM reduces the amount of virtual memory required. Allows more in use data to be stored.
What is stored in ROM?
Stores the Boot Program (Boot Loader) which starts the operating system Stores the firmware in an embedded system
What are the key facts about ROM?
Read Only Memory (ROM) * Primary Memory * Non-volatile - data is stored when power is lost * Quick to start up * Stores the Boot Program (Boot Loader)
What is virtual storage?
Not physically on your computer, you only access the files from a remote location via a network/internet Examples: Network Drives | Cloud Storage
What are the advantages of virtual storage?
• Backups automatically saved on the cloud for recovery if needed • Data can be accessed anywhere with an internet connection • Data can be easily shared and worked on collaboratively • Stored away from the computer in case of disaster, data is not damaged. • Storage can be expanded as necessary
What are the disadvantages of virtual storage?
• Dependent on internet connection that is fast enough • Privacy Issues - Data is held by a third-party, so you are putting trust in them to store your data. • One cloud storage company could be hacked meaning thousands of companies hacked • Reliant on servers of the company providing the connection (possible down time).